Item 1.
1(a) Name of Issuer: Sage Therapeutics, Inc.
1(b) Address of Issuer’s Principal Executive Offices:
215 First Street, Cambridge, MA 02141
Item 2.
2(a) Name of Person Filing: BB Biotech AG (“BB Biotech”) on behalf of its wholly-owned subsidiary, Biotech Target N.V. (“Biotech Target”)
2(b) Address of Principal Business Office or, if none, Residence:
BB Biotech AG: Schwertstrasse 6, CH-8200 Schaffhausen, Switzerland
Biotech Target N.V.: Ara Hill Top Building, Unit A-5, Pletterijweg Oost 1, Curaçao
2(c) Citizenship: BB Biotech AG: Switzerland
Biotech Target N.V.: Curaçao
2(d) Title of Class of Securities: Common Stock, par value $0.0001 per share
2(e) CUSIP Number: 78667J108
Item 4. Ownership
Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.
| (a) | Amount beneficially owned: 4,460,693 |
| (b) | Percent of class: 7.3% |
| (c) | Number of shares as to which the person has: |
| (i) | Sole power to vote or to direct the vote 0 |
| (ii) | Shared power to vote or to direct the vote 4,460,693 |
| (iii) | Sole power to dispose or to direct the disposition of 0 |
| (iv) | Shared power to dispose or to direct the disposition of 4,460,693 |
Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company or Control Person.
This statement is filed jointly by BB Biotech and Biotech Target, Biotech Target is a wholly-owned subsidiary of BB Biotech.